Frenchman has goal - to cause harm (4)
I believe the answer is:
maim
'harm' is the definition.
(thesaurus)
'frenchman has goal' is the wordplay.
'frenchman' becomes 'm' (abbreviation for Monsieur - like 'Mr').
'has' is a charade indicator (letters next to each other).
'goal' becomes 'aim' (aim is a kind of goal).
'm'+'aim'='MAIM'
'to cause' is the link.
(Other definitions for maim that I've seen before include "Injure and cripple" , "Disable, lame" , "seriously hurt!" , "Injure seriously, leaving permanent damage" , "Injure or harm severely" .)